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21C1-1-9 — SWITCH,PRESSURE

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

21C1-1-9: SWITCH,PRESSURE.

The SWITCH,PRESSURE is a the manufacturer industrial component. Key specifications include terminal_type: CONNECTOR, RECEPTACLE, proof_pressure: 311.00 POUNDS PER SQUARE INCH GAGE LBS, outside_diameter: 0.438 INCHES NOMINAL SINGLE CONNECTION IN, overall_diameter: 1.120 INCHES NOMINAL IN, style_designator: CYLINDRICAL, width_across_flats: 0.688 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5930-01-337-5063, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ 21C1-1-9
NSN: 5930-01-337-5063
FSC: 5930 — Switches
CAGE: 02750 — EATON AEROSPACE LLC DBA EATON INOAC DIV FLUID & ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
terminal_typeCONNECTOR, RECEPTACLE
proof_pressure311.00 POUNDS PER SQUARE INCH GAGE LBS
outside_diameter0.438 INCHES NOMINAL SINGLE CONNECTION IN
overall_diameter1.120 INCHES NOMINAL IN
style_designatorCYLINDRICAL
width_across_flats0.688 INCHES NOMINAL IN
pressure_switch_typeDIFFERENTIAL
contact_adjustabilityACTUATION POINT NOT ADJUSTABLE AND DEACTUATION POINT NOT ADJUSTABLE
operating_temp_rating-65.0 FAHRENHEIT MINIMUM AND 325.0 FAHRENHEIT MAXIMUM DEGF
contact_action_stimulusINCREASE
contact_stimulus_rating43.50 ACTUATION POINT NOMINAL POUNDS PER SQUARE INCH GAGE AND 38.00 DEACTUATION POINT NOMINAL POUNDS PER SQUARE INCH GAGE
pressure_connector_typeDOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, THREADED EXTERNAL SINGLE CONNECTION
NSN5930-01-337-5063
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SWITCH,PRESSURE TITLE COMPONENT PN 21C1-1-9 MFR SWITCH,PRESSURE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.688 INCHES NOMINAL IN
•
CONTACT ACTION STIMULUS: INCREASE
•
TERMINAL TYPE: CONNECTOR, RECEPTACLE
•
OVERALL DIAMETER: 1.120 INCHES NOMINAL IN
•
PROOF PRESSURE: 311.00 POUNDS PER SQUARE INCH GAGE LBS
•
CONTACT LOAD CURRENT RATING: 2.0 AMPERES RESISTIVE LOAD SINGLE VOLTAGE
•
STYLE DESIGNATOR: CYLINDRICAL
•
OUTSIDE DIAMETER: 0.438 INCHES NOMINAL SINGLE CONNECTION IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.688 INCHES NOMINAL IN
CONTACT ACTION STIMULUSINCREASE
TERMINAL TYPECONNECTOR, RECEPTACLE
OVERALL DIAMETER1.120 INCHES NOMINAL IN
PROOF PRESSURE311.00 POUNDS PER SQUARE INCH GAGE LBS
CONTACT LOAD CURRENT RATING2.0 AMPERES RESISTIVE LOAD SINGLE VOLTAGE
STYLE DESIGNATORCYLINDRICAL
OUTSIDE DIAMETER0.438 INCHES NOMINAL SINGLE CONNECTION IN
PRESSURE SWITCH TYPEDIFFERENTIAL
PRESSURE CONNECTOR TYPEDOUBLE THREADED SECTION BOSS FITTING GASKET WITH LOCKNUT SEALING, THREADED EXTERNAL SINGLE CONNECTION
OTHER ITEMS IN FSC 5930 — Switches
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5930-00-000-0117 5930-00-001-1407 5930-00-001-1890 5930-00-001-2571 5930-00-001-2575 5930-00-001-2580 5930-00-001-2608 5930-00-001-2609
SUBSTITUTES & CROSS-REFERENCES 2
10135393Reference document
Same NSN cross-reference
Reference document — Informative reference only
74B838001-117Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21C1-1-9?
21C1-1-9 is a SWITCH,PRESSURE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21C1-1-9?
There are 2 known substitutes for 21C1-1-9: 10135393, 74B838001-117. Substitute compatibility should be verified for your specific system.
What is the NSN for 21C1-1-9?
21C1-1-9 is cataloged in the U.S. Government catalog under NSN 5930-01-337-5063. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.